Specifications

Logamax plus GB142 applications manual | 01.2012 Technical specifi cations are subject to change without prior notice
GB142 Applications Manual
| 43
3.5 System 5: Multi-boiler Cascade
Summary:
Multi-boiler system with staging control and many options for
heat distribution.
• MCM10 Staging control each for 2 to 4 boilers and a
maximum of 16 boilers per system
• Boiler rotation based on hours run time
• Different options for input of heat demand:
- AM10 outdoor reset controller
- 0-10V input for output power control (boiler modulation)
- 0-10V input for supply water temperature control
- Dry contact input
- RC35 outdoor reset control with room influence
Boilers are piped in reverse-return for equal flow rate through all
boiler headers.
In detail:
The cascade controller fires, runs, and modulates the boilers
based on heat demand, plus rotates the boilers to achieve
equal run time.
The cascade controller strives to run boilers at low fire for the
longest time possible where efficiency is at their highest.
Low loss headers decouple the boilers from the system loop
independently of the number of zones calling. Boilers are piped
in reverse-return for equal flow rate through all boiler headers.
Required components:
• GB142 boilers with individual manifolds and low loss
header
• MCM10 multi cascade module (up to 4 boilers each)
• Heat demand input via:
- AM10 outdoor reset controller
- 0-10V input (output power or system supply water
temperature)
- Dry contact input
- RC35 outdoor reset control with room influence